Structural, optical and NO2 gas sensing properties of ZnMgO thin films prepared by the sol gel method
| Autor: | Christèle Vilar, I. Madhi, W. Chebil, A. Fouzri, M.A. Boukadhaba, Alain Lusson, Vincent Sallet |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Spin coating Materials science Absorption spectroscopy Magnesium Band gap Analytical chemistry chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials chemistry Electrical resistivity and conductivity 0103 physical sciences Electrical and Electronic Engineering Thin film 0210 nano-technology Sol-gel Wurtzite crystal structure |
| Zdroj: | Physica B: Condensed Matter. 505:9-16 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2016.10.028 |
| Popis: | In this present work, ZnO and ZnMgO thin films prepared by a sol-gel process were deposited on glass substrates via spin coating technique. The structural, morphological and optical properties of the obtained films were investigated. X-ray diffraction study revealed that all layers exhibit a hexagonal wurtzite structure without any secondary phase segregation. The atomic force microscopy (AFM) depicts that the grains size of ours samples decreases as magnesium content increases. The absorption spectra obtained on ZnMgO thin films show a band gap tuning from 3.19 to 3.36 eV, which is also consistent with blue shifting of near-band edge PL emission, measured at low temperature. The incorporated amount of magnesium was calculated and confirmed by EDX. The gas sensing performances were tested in air containing NO 2 for different operating temperatures. The experimental result exhibited that ZnMgO sensors shows a faster response and recovery time than the ZnO thin films. The resistivity and the sensor response as function of Mg content were also investigated. |
| Databáze: | OpenAIRE |
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